The relative contribution of scene context and target features to visual search in scenes

Castelhano, Monica S.; Heaven, Chelsea · 2010 · OpenAlex-citations

DOI: 10.3758/app.72.5.1283

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Summary

This study investigates the relative contributions of scene context and target features to visual search performance in natural scenes. While previous research established that knowing a target’s visual features improves search over knowing only its name, and that scene context facilitates object search, it remained unclear how these two sources of information interact. Specifically, the authors examined whether general semantic knowledge (scene gist) or specific visual details of the scene drive search guidance, and how these factors combine with target-feature information. The study aimed to determine if scene context and target features affect search independently or synergistically, and whether they influence early attentional guidance or later verification processes. The researchers conducted two experiments using eye-tracking technology to monitor search behavior. Participants searched for specific targets within photographic scenes after receiving cues about the scene and the target. The cues varied by modality: participants were shown either a picture or a word (category name) for the scene, and either a picture or a word for the target. This design allowed the authors to isolate the effects of visual details versus semantic gist for both the scene and the target. Eye movement measures were analyzed to assess two components of search: attentional guidance (time and fixations required to first fixate the target) and verification (time spent confirming the target after fixation). The results demonstrated that both scene context and target features improved search performance, but they affected different components of the process. Target-feature information (picture cues) significantly improved the speed of target recognition and verification, reducing the time spent examining the target once fixated. In contrast, scene context primarily improved attentional guidance. Crucially, the visual details of the scene played a more significant role in guiding attention than the scene’s gist alone; participants who viewed a picture of the scene made fewer fixations and had shorter latencies to find the target compared to those who only received the scene’s name. The effects of scene context and target features were largely additive rather than interactive, meaning that having both types of information provided cumulative benefits without diminishing returns. These findings suggest that visual search in natural scenes relies on distinct mechanisms for guidance and verification. Scene context, particularly its visual details, aids in directing attention to likely target locations, while target features facilitate the rapid identification and confirmation of the object. The study highlights that general semantic knowledge (gist) is insufficient for optimal guidance; specific visual details of the scene are necessary to effectively narrow the search space. This distinction clarifies the functional roles of top-down influences in visual search, indicating that scene layout and target appearance contribute independently to efficient visual processing.

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• visual search